Structural Adhesive Film

AF 126 • AF 126 FR

- 5 -

Product Performance (continued)

Effect of Cure Variables

3M™ Scotch-Weld™ Structural Adhesive Primer EC-2320 primer shows the effects of varying cure time, pressure,

temperature rise rate and primer dry time and temperature. Results are overlap shear tests made on 1/2" (12.5 mm)

lap joint specimens of 0.063" (1.6 mm) clad 2024-T3 aluminum.

Cure Time Experiment

Adhesive Cure

Overlap Shear Test Results

Time (hours)

-67°F

-55°C

75°F

24°C

180°F

82°C

250°F

121°C

1

5453 psi

37.6 MPa

5060 psi

34.9 MPa

3160 psi

21.8 MPa

1507 psi

10.4 MPa

2

5397 psi

44.1 MPa

5460 psi

37.6 MPa

3447 psi

23.7 Mpa

1591 psi

11.0 MPa

3

5507 psi

37.9 MPa

5560 psi

38.3 MPa

3523 psi

24.3 Mpa

1575 psi

10.9 MPa

Cure Cycle: 6-8°F/minute rise, 225°F, 50 psi, time as stated (3.3-4.4°C/minute rise, 107°C, 0.35 MPa, time as stated).

Cure Pressure Experiment

Overlap Shear Test Results

Cure Pressure

-67°F

-55°C

73°F

23°C

180°F

82°C

250°F

121°C

25 psi

0.17 MPa

5247 psi

36.2 MPa

5040 psi

34.7 MPa

2960 psi

20.4 MPa

1315 psi

9.1 MPa

50 psi

0.35 MPa

5793 psi

39.9 MPa

5387 psi

37.1 MPa

3160 psi

21.8 MPa

1190 psi

8.2 MPa

100 psi

0.69 MPa

5230 psi

36.0 MPa

5393 psi

37.2 MPa

2940 psi

20.3 Mpa

1387 psi

9.6 MPa

Cure Cycle: 5-8°F/minute rise, 90 minutes @ 225°F, pressure as stated (2.8-4.4°C/minute rise, 90 minutes @ 107°C, pressure as stated).

Cure Rise Rate Experiment

Rise Rate

Overlap Shear Test Results

°F (°C)/Minute

-67°F

-55°C

73°F

23°C

180°F

82°C

250°F

121°C

2

1.1

5377 psi

37.0 MPa

5093 psi

35.1 MPa

3270 psi

22.5 MPa

1472 psi

10.1 MPa

7

3.9

5793 psi

39.9 MPa

5387 psi

37.1 MPa

3160 psi

21.8 MPa

1190 psi

8.2 MPa

12

6.7

5403 psi

37.2 MPa

5333 psi

36.7 MPa

3203 psi

22.1 Mpa

1431 psi

9.9 MPa

Cure Cycle: 90 minutes @ 225°F, 50 psi, rise rate as stated (90 minutes @ 107°C, 0.35 MPa, rise rate as stated).

Note: The following technical information and data should be considered representative or

typical only and should not be used for specification purposes.